<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>

    </title>
    <style>
        /*BUG*/
        .c1{
            margin-bottom :40px; ;
            height: 100px;
            background-color: rgb(219, 24, 24);
        }
        .c2{
            margin-top: 80px;
            height: 100px;
            background-color: rgb(26, 136, 226);
        }
    </style>
</head>
<body>
    <div class="c1"></div>
    <div class="c2"></div>
</body>
</html>